C + + operator overloading is non-member function

1#include <iostream>2 using namespacestd;3 classcomplex{4  Public:5Complex (DoubleR=0.0,DoubleI=0.0): Real (R), Imag (i) {}6Friend Complexoperator+ (ConstComplex &c1,ConstComplex &C2);7Friend Complexoperator- (ConstCOMPLEX&AMP;C1,ConstComplex &C2);8Friend Ostream &operator<< (Ostream & out,ConstComplex &c);9 Private:Ten     DoubleReal,imag; One }; AComplexoperator+ (ConstComplex &c1,ConstComplex &C2) - { -     returnComplex (c1.real+c2.real,c1.imag+c2.imag); the } -Complexoperator- (ConstComplex &c1,ConstComplex &C2) - { -     returnComplex (c1.real-c2.real,c1.imag-c2.imag); + } -Ostream &operator<< (Ostream & out,ConstComplex &c) + { A      out<<"("<<c.real<<","<<c.imag<<")"; at     return  out; - } - intMain () - { -Complex C1 (5,4), C2 (2,Ten), C3; -cout<<"c1="<<c1<<Endl; incout<<"c2="<<c2<<Endl; -C3=c1-C2; tocout<<"c3=c1-c2="<<c3<<Endl; +c3=c1+C2; -cout<<"c3=c1+c2="<<c3<<Endl; the     return  0; *}

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C + + operator overloading is non-member function